Adding new setting LTE_SERVICE_FORCED.

Bug: 18328639
Change-Id: Icbf9d7987d27af34cbe4ee1b4e9df19e139c2fc7
diff --git a/core/java/android/provider/Settings.java b/core/java/android/provider/Settings.java
index 0be4aea..3c12e06 100644
--- a/core/java/android/provider/Settings.java
+++ b/core/java/android/provider/Settings.java
@@ -6601,6 +6601,15 @@
         public static final String ENHANCED_4G_MODE_ENABLED = "volte_vt_enabled";
 
         /**
+         * Whether user can enable/disable LTE as a preferred network. A carrier might control
+         * this via gservices, OMA-DM, carrier app, etc.
+         * <p>
+         * Type: int (0 for false, 1 for true)
+         * @hide
+         */
+        public static final String LTE_SERVICE_FORCED = "lte_service_forced";
+
+        /**
          * Settings to backup. This is here so that it's in the same place as the settings
          * keys and easy to update.
          *
diff --git a/packages/SettingsProvider/src/com/android/providers/settings/DatabaseHelper.java b/packages/SettingsProvider/src/com/android/providers/settings/DatabaseHelper.java
index 1771eac..175b424 100644
--- a/packages/SettingsProvider/src/com/android/providers/settings/DatabaseHelper.java
+++ b/packages/SettingsProvider/src/com/android/providers/settings/DatabaseHelper.java
@@ -2620,8 +2620,7 @@
             // Set the preferred network mode to target desired value or Default
             // value defined in RILConstants
             int type;
-            type = SystemProperties.getInt("ro.telephony.default_network",
-                        RILConstants.PREFERRED_NETWORK_MODE);
+            type = RILConstants.PREFERRED_NETWORK_MODE;
             loadSetting(stmt, Settings.Global.PREFERRED_NETWORK_MODE, type);
 
             // Set the preferred cdma subscription source to target desired value or default
diff --git a/telephony/java/com/android/internal/telephony/RILConstants.java b/telephony/java/com/android/internal/telephony/RILConstants.java
index a6d6daa..082e8bbb 100644
--- a/telephony/java/com/android/internal/telephony/RILConstants.java
+++ b/telephony/java/com/android/internal/telephony/RILConstants.java
@@ -24,6 +24,8 @@
  * Also they should all probably be static final.
  */
 
+import android.os.SystemProperties;
+
 /**
  * {@hide}
  */
@@ -86,7 +88,8 @@
     int NETWORK_MODE_LTE_CDMA_EVDO_GSM_WCDMA = 10; /* LTE, CDMA, EvDo, GSM/WCDMA */
     int NETWORK_MODE_LTE_ONLY       = 11; /* LTE Only mode. */
     int NETWORK_MODE_LTE_WCDMA      = 12; /* LTE/WCDMA */
-    int PREFERRED_NETWORK_MODE      = NETWORK_MODE_WCDMA_PREF;
+    int PREFERRED_NETWORK_MODE      = SystemProperties.getInt("ro.telephony.default_network",
+            NETWORK_MODE_WCDMA_PREF);
 
     int CDMA_CELL_BROADCAST_SMS_DISABLED = 1;
     int CDMA_CELL_BROADCAST_SMS_ENABLED  = 0;